How many watts would a de-icer need?

Vienna, VA(Zone 7a)

I don't have fish in my pond (just frogs), but I plan to buy a de-icer to help the frogs and to try to over-winter water lilies. The temperature in my area (Northern Virginia) usually doesn't go below 20 degrees. The pond is a pre-formed one that is 7 ft. long, 4 ft. wide and 18" deep. Could someone recommend a suitable wattage for the de-icer? Thanks.

(Mary) Anchorage, AK(Zone 4b)

I would think that 350W would be sufficient. We run 750W up here but we can get up to 2' of ice on our pond which is only 30" in the shallows and 36" in the deep

Athens, PA(Zone 5b)

I totally agree - Vienna, you don't need anything like Mary does in her area. I wish we only got to 20 degrees above for our low. Vienna are you in a zone 7?

Nooksack, WA

Vienna
I have about the same climate as you and my pre-formed is about the same size as yours. Last year I used a 1000W thermostatically controlled stock tank heater and it was way over kill. The plants around the pond stayed green when everything else was covered with snow. This year I'm using a small pump with a Kent Turbo Venturi with small air hose to surface to keep the ice open and adds oxygen to the water (pictured). Will save my electric bill some. The fish did like hanging out around the heater though.
Here's a link to venturi: http://www.marinedepot.com/Kent_Marine_Black_Turbo_Venturi_3_4_inch_Accessories_for_Aquarium_Reef_Protein_Skimmers-Kent_Marine-KM2851-FIPSAC-vi.html

And here is some good information for winterazition and covers frogs and such a little:
http://www.skippysstuff.com/wintrtip.htm

Thumbnail by Spitzkopf
Vienna, VA(Zone 7a)

Thanks to all of you for very helpful information. As you can tell, I'm new at pond-keeping, but after seeing all of our plants die and finding a dead frog in the pond this past spring, I'm going to try to do better this year. I'm going to order a de-icer right now while I'm thinking about it. I'm in Zone 6, although over the last few years our climate has been moving towards the Zone 7 range. Thanks for the link to skippysstuff, Spitzkopf; that was interesting.

(Mary) Anchorage, AK(Zone 4b)

Yes, thanks from me too on the skippy stuff. I like the aerator idea. We pumped water through the pond last year but lost all large fish. We figured it was too much water movement while the fish were dormant and it somehow kept them agitated? Just don't know. We had very little ice, maybe 6" which left a good amount of water and had three open holes going in the ice to release gases.

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